This is an Esmeralda baby donut pillow. Designed with a baby's head shape in mind, the indentation in the center gently fits the back of the head. It supports the prevention of head shape unevenness (flat head syndrome) caused by sleeping position preference. The white base with black polka dots is simple yet cute, and easy to use for both boys and girls. This baby pillow is recommended for naps and bedtime. I received this from someone, but I didn't use it because my baby's head shape was already fine.